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Spar Gauge (3D Model)

Designed by  2

  • 3D Printable Model
  • STL File
  • Includes parts list and printing instructions
Spar Gauge 3D Model

Trying to make a perfectly round mast? With this spar gauge you can turn any square stock into an 8-sided beam.

3D Printed Spar Gauge

What you’ll get:

  • STL file of the Spar Gauge
  • Printing Instructions
  • List of exact parts and dimensions

About the design

I designed this spar gauge for a friend who builds small sailing boats. Because DIY spar gauges are not that accurate, he asked me to design a 3D printable model. 

This model can be printed as one. You will need to add threaded inserts to the side afterwards, to allow bolts or threaded knobs to be inserted to secure the pencils. This is very easy with a soldering iron, and secures the inserts very well.

Don’t have a 3D printer? We also sell completely finished, physical versions of this spar gauge.


  1. I’m building a drift boat and making my own oars. Have made my own spar gauges from hard wood but the tolerances aren’t precise enough. Found this file and had it 3D printed by our students at school. AWESOME RESULTS!! This thing is an amazing and simple tool. Thanks so much for sharing!

    Jeff Chalmers
    • Glad to hear you found it useful Jeff! Hope your boat and oars turn out great.


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